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STATIC TESTING
Static tests must confirm on-vehicle and bench
tests. For best results, disassemble the alterna-
tor, as needed, to access the parts.
Equipment
• Digital Multimeter (DMM)
• Ammeter (digital, inductive)
• Regulator tester
Identification Record
Alternator model number ______________
Regulator model number ______________
Set point(s) listed on regulator __________
Regulator Tester
A regulator tester can test all regulator functions. If a
regulator tester is used, follow the regulator tester
manufacturer's instructions.
If a regulator tester is not available, the regulator can
only be tested for a shorted power transistor.
D10-22
Check For Shorted Power Transistor
1. Set the DMM to the diode test scale and zero
the meter.
2. Connect one meter lead to pin A (F-, Figure 10-
11) connector socket in the regulator, and con-
nect the other lead to pin C (B-) connector
socket in the regulator. Observe the meter read-
ing.
3. Reverse the leads and observe the meter reading.
4. In one direction, the DMM must register a tone.
In the other direction, the DMM must show OL
(out of limits).
5. If the DMM shows zero in both directions, the
power transistor is shorted and the regulator
must be replaced.
NOTE: If regulator failure is indicated, field coil failure
must also be suspected.
Battery Charging Alternator
FIGURE 10-11. PIN CONNECTION
IDENTIFICATION
D10003 07/06
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